<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .main{
            display: flex;
            align-content: center;
            text-align: center;
        }
    </style>
</head>
<body>
    <div class="main">

        <form action="/doLogin" method="post">
           用户名 <input type="text" name="username"> <br>
            密码 <input type="password" name="password" > <br>
             <input type="hidden" name="url" th:value="${url}" > <br>
            <input type="submit">提交
        </form>

    </div>

</body>
</html>